You are right. You may be having insect bite. There may be insect toxic dermatitis
. The affected area may become erythematous and vesicular or bullous lesions.there may be swelling also. But as you said the lesion is healing. And now you have swelling and crawling sensation. If needed, you may continue antibiotics for 1 to 2 weeks. Take anti inflammatory drugs.keep the affected foot elevated. For crawling sensation, it may be vague and of no importance. However,you may take fluoxetin 10 mg daily till you feel better.
I hope you got my answer.
Dr. Ilyas Patel MD